Here is what I was thinking, Ethereum blockchain has capabilities to support and make it so easy to create tokens through smart contracts on the mainnet unlike Bitcoin. Otherwise, if it was that easy on bitcoin minus creating or using side-chains, we would be having a ton of tokens on the Bitcoin network that are not just NFTs given that Bitcoin is the oldest network.

It's probably not feasible, or it involves a lot of meandering for one to have an NFT based on bitcoin.